LFP-5K-48V Installation Manual

Rev. 4.1_4.9.20
505 Keystone Rd, Southampton, PA 18966, USA . [phone]. [e-mail] . www.fortresspower.com
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4.7 Final Connection of the Installation
Final installation and operation guidelines will be dictated by your Electrician and Installer based on the
overall properties of and procedures for the equipment in your installation and any code requirements
that apply to your region. Fortress Power technicians and sales staff are available to provide any
additional information on the Fortress Lithium Batteries as needed. Please be aware of the potential
electrical hazards before interacting with any and all electrical or mechanical devices. Please take all
necessary safety precautions in your projects and installations.
5. PARALLEL CONNECTION
Fortress Lithium Batteries with the same capacity may be connected in parallel for up to 2 units only.
All wires should be an appropriate gauge and constructed to handle the loads that will be placed upon
it. Heavy gauge, high strand copper wire is the industry standard due to its stability, efficiency and
overall quality. A qualified installer should understand this and must adhere to the industry standard and
published electrical guidelines.
Please follow the procedure to parallel LFP-5K-48V batteries.
1. Prepare 4 of 2/0 AWG Battery Cables in the same length and “+” and “–“ terminal busbar.
2. Check all Battery voltages. Use the Voltmeter to measure each battery’s voltage via positive
and negative terminal sitting on the top of the battery. The voltage difference between/among
the batteries must be smaller than 0.2 V. If not, please use charge controller or inverter to
charge the battery with lower voltage to within the required voltage range of 0.2 V.
3. Put air breaker in “OFF” position
4. Power off the inverter and wait for 5 minutes and longer, before you connect the inverter’s
positive terminal to the “+” busbar, and its negative terminal to the “-” busbar.
CAUTION! For parallel connecting: Maintain identical wire lengths and wire construction
from each Fortress Power Battery terminal to the common bus.
CAUTION! For connecting multiple units: Maintain the recommended distance among
units - at least 5in (12mm).
5. Connect the positive and negative common bus to the inverter
6. Switch air breaker to “ON” position
7. Turn on the inverter.
CAUTION! Verify polarity at all connections with a standard voltmeter before energizing
the system. Reverse polarity at the battery terminals will void the Warranty and destroy
the batteries. Do not short circuit the batteries.